Conventional superconductorlike behavior of the superconducting transitionof La2-xSrxCuO4 (x similar to 0.12) in magnetic fields

The superconducting transition in the electrical resistivity has been exami ned for La2-xSrxCuO4 (x similar to 0.12) single crystals in magnetic fields . The broadening of the transition width in high fields is small compared t o the case of the optimum doping (x similar to 0.15) and the transition cur ve as a function of the temperature in each magnetic field shifts to lower temperature in almost parallel with applying magnetic field similar to the case of conventional superconductors. These results indicate that the super conducting fluctuation is weakened and that the coherence length in the CuO 2 plane becomes much longer around x=0.12. The measurement results are disc ussed in relation to the appearance of long-range magnetic order. [S0163-18 29(99)01837-8].